EP1944853A2 - Drehende elektrische Maschine mit Zwangskühlung - Google Patents

Drehende elektrische Maschine mit Zwangskühlung Download PDF

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Publication number
EP1944853A2
EP1944853A2 EP08000490A EP08000490A EP1944853A2 EP 1944853 A2 EP1944853 A2 EP 1944853A2 EP 08000490 A EP08000490 A EP 08000490A EP 08000490 A EP08000490 A EP 08000490A EP 1944853 A2 EP1944853 A2 EP 1944853A2
Authority
EP
European Patent Office
Prior art keywords
air ducts
stator core
stator
wedges
cooling gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08000490A
Other languages
English (en)
French (fr)
Other versions
EP1944853B1 (de
EP1944853A3 (de
Inventor
Kenichi Hattori
Tadaaki Kakimoto
Akitomi Semba
Mitsuru Saeki
Mitsunori Sezaki
Takashi Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Power Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1944853A2 publication Critical patent/EP1944853A2/de
Publication of EP1944853A3 publication Critical patent/EP1944853A3/de
Application granted granted Critical
Publication of EP1944853B1 publication Critical patent/EP1944853B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/16—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the cooling medium circulates through ducts or tubes within the casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices

Definitions

  • the present invention relates to a forced cooling rotary electric machine configured so that cooling gas is caused to flow forcedly by a self-cooling fan provided on a rotating shaft or a separate type air blower to cool internal equipment in the rotary electric machine such as a turbine generator and an electric motor. More particularly, it relates to a forced cooling rotary electric machine suitable for cooling a stator core that is subjected to a variable magnetic field and is heated.
  • the temperature distribution in the axial direction of the stator core is uniformized by changing the ventilation cross-sectional areas of the air ducts while the core stacking pressure between the adjacent air ducts is made equal, or the temperature distribution in the axial direction of the stator core is uniformized by changing the core stacking pressure between the adjacent air ducts each having the same ventilation cross-sectional area.
  • cooling gas can be distributed in the axial direction of the stator core in a well-balanced manner.
  • the temperature distribution in the axial direction of the stator core can be thus uniformized to some degree.
  • An object of the present invention is to provide a forced cooling rotary electric machine in which the temperature distribution is brought close to the designed temperature distribution, by which a larger size thereof can be avoided.
  • the invention is configured so that a wedge formed with a ventilation groove and a wedge formed with no ventilation groove are used to regulate the flow rates of cooling gas passing through air ducts.
  • the wedge with no ventilation groove is used in the air duct provided in an area of a stator core where the temperature is low (the air duct in a cooling path having small flow path resistance) to restrict the flow rate, and by just that much, cooling air can be caused to flow to another air duct (the air duct in a cooling path having large flow path resistance).
  • the wedge formed with the ventilation groove is used in the air duct provided in an area of the stator core where the temperature is high (the air duct in the cooling path having the large flow path resistance), so that the cooling gas can be caused to flow positively.
  • Temperature distribution in the axial direction of the stator core can be thus uniformized. As a result, the temperature distribution in the axial direction of the stator core can be brought close to the designed temperature distribution, and a forced cooling rotary electric machine that need not be made larger in size with a margin can be obtained.
  • the forced cooling turbine generator shown here is a forced cooling turbine generator in which a cooling gas is circulated in the machine without using outside air, and cooling is made in such configuration regardless of the kind of cooling gas.
  • the forced cooling turbine generator 1 is generally comprised of a rotor 3 formed on a rotating shaft 2, a stator 4 provided at the outer periphery of the rotor 2 with a gap G being provided therebetween, an end frame 6 supporting the rotating shaft 2 via bearings 5, a stator frame 7 fixed to the end frame 6 and supporting the stator 4, and a housing 7H covering the stator frame 7 to form an enclosed structure together with the end frame 6.
  • Fans 2F are respectively provided on both sides of the rotating shaft 2 with the rotor 3 held therebetween, as shown in Fig. 1 , fans 2F are provided. By these fans 2F, the cooling gas is introduced into the gap G between the rotor 3 and the stator 4, and is supplied toward the central part side in the axial direction of the rotor 3.
  • the rotor 3 has a field core and a field winding wound around the field core and forms a plurality of magnetic poles in the circumferential direction.
  • the stator 4 is comprised of a stator core 8 that is formed by stacking silicon steel plates in the axial direction of the rotating shaft 2 and by clamping the lamination ends with end clamps 8E, a plurality of U-shaped winding grooves 9 that each have a depth increasing from the inside of the stator core 8 toward the outside thereof, are formed entirely along the stacking direction of the stator core 8, and are formed at equal intervals in the circumferential direction, a stator winding 10 incorporated in the winding grooves 9, and a wedge 11 that is driven in a wedge groove 9W formed on the opening side of each winding groove 9 to fix the stator winding 10 in the winding groove 9.
  • the stator core 8 is formed with a plurality of air ducts 13 that lead from the inside to the outside with duct spacers 12 ( Fig. 3 ) being interposed between the stacked silicon steel plates every a predetermined number of sheets to perform cooling.
  • These air ducts 13 are formed at equal intervals, and packets 8P, each of which is the stacking unit of silicon steel plates positioned between the air ducts 13, are formed so as to each have the same thickness.
  • partition walls 14 are provided every a plurality of packets, by which ventilation zones 15A1, 15A2 that allow the cooling gas to flow from the inside to the outside diameter side and ventilation zones 15B that allow the cooling gas to flow from the outside to the inside diameter side are formed alternately in plural numbers.
  • the stator 4 of the forced cooling turbine generator configured as above is cooled as described below.
  • the cooling gas pressurized by the fans 2F is introduced into the gap G between the rotor 3 and the stator 4, and is supplied toward the center side in the axial direction of the gap G.
  • the cooling gas flows from the inside to the outside, and flows to the back surface side of the stator core 8. From there, the cooling gas reaches the fans 2F via a cooler, not shown.
  • the cooling gas pressurized by the fans 2F is introduced to the back surface side of the stator core 8 via air ducts, not shown.
  • the cooling gas flows from the outside to the inside of the air ducts 13, and reaches the air ducts 13 of the adjacent ventilation zones 15A1 and 15A2 after passing through the gap G. Then, the cooling gas flows from the inside to the outside, reaching the back surface side of the stator core, and from there, reaches the fans 2F via the cooler, not shown.
  • the stator core 8 is cooled.
  • a large quantity of the cooling gas flows, and in the ventilation zones 15A2, 15B distant from the fans 2F, a small quantity of the cooling gas flows.
  • a difference in flow rate of cooling gas is caused by the difference in flow path resistance resulted from the difference in length between circulation flow paths, which are cooling gas flow paths in which the cooling gas flows through the fans 2F and the air ducts 13.
  • Such nonuniformity of the flow rate of the cooling gas results in nonuniformity of cooling temperature.
  • the cooling temperature is uniformized by adjusting the nonuniformity of the flow rate of the cooling gas by the wedges 11.
  • the circulation flow paths of the cooling gas passing through the air ducts 13 opposed to the ventilation zones 15A1 close to the fans 2F are short and the flow path resistance is small, and a large quantity of the cooling gas flows in these air ducts 13. Therefore, to the stator core 8 opposed to the ventilation zones 15A1, wedges 11A, which have the same trapezoidal cross section over the total length as shown in Fig. 2 , are applied. As shown in Fig.
  • the wedges 11A facing to the air ducts 13 serves as resistance members, so that the cooling gas flowing in the air duct 13 is throttled and its flow rate is restricted.
  • the circulation flow paths of the cooling gas, which pass through the air ducts 13 opposed to the ventilation zones 15A2, 15B distant from the fans 2F are long and the flow path resistance is large, the flow rate of the cooling gas is restricted. Therefore, to the stator core 8 opposed to the ventilation zones 15A2, 15B, wedges 11B, which are provided with ventilation grooves 11G at positions opposed to the air ducts 13 as shown in Fig. 4 , are applied. As shown in Fig.
  • the wedges 11A and 11B serve as flow path resistance regulating means for uniformizing the flow path resistances of the cooling gas flow paths and flow rate regulating means for uniformizing the flow quantities of the cooling gas flow paths according to the invention.
  • the cooling gas temperature and the temperature distribution in the axial direction of the stator core could be uniformized as shown in Fig. 7 .
  • the thickness of a packet 8P which is the stacking unit of silicon steel plates at the both end parts in the axial direction is also increased.
  • temperature of these parts rises in proportion to the square of the packet thickness, and as shown in Fig. 7 , the temperature rise at the both end parts in the axial direction of the stator core is remarkable.
  • the thickness of the packet 8P is the same over the length in the axial direction of the stator core 8, and the temperature distribution in the axial direction of the stator core 8 could be uniformized approximately as the temperature distribution of the cooling gas.
  • the temperature distribution in the axial direction of the cooling gas and the stator core 8 can be uniformized approximately, the temperature rise of the whole can be restrained effectively, and also portions where temperature rises remarkably are eliminated. Therefore, there is no need to increase the size of the turbine generator so as to give a margin to the cooling capacity.
  • the circulation flow path of the cooling gas passing through the air duct 13 of the ventilation zone 15A1 close to the fan 2F is from the fan 2F and returns to the fan 2F through the gap G, the air duct 13 and the back surface of stator core.
  • differences in circulation flow path length of cooling gas are caused in the circumferential direction of the air duct 13.
  • a difference in length of circulation flow path arises between the circulation flow path of the cooling gas passing through the side close to the discharge side and the circulation flow path of the cooling gas passing through the side distant from the discharge side.
  • the circulation flow path is long, the flow path resistance increases, and the flow rate of the cooling gas flowing there is restricted.
  • the wedges 11B having the ventilation grooves 11G are provided on the side where the circulation flow paths of the cooling gas are long, and the wedges 11A having the trapezoidal cross section over the total length are provided on the side where the circulation flow paths of the cooling gas are short.
  • the wedges 11A having the same trapezoidal cross section over the total length are used in the upper half of the air duct 13 to restrict the flow rate of the cooling gas, and the wedges 11B having the ventilation grooves 11G are used in the lower half of the air duct 13 to increase the flow rate of the cooling gas.
  • the flow path resistance is increased in the upper half of the air duct 13, and the flow path resistance is decreased in the lower half thereof, so that the flow rate of the cooling gas is uniformized.
  • the flow path resistance in the circumferential direction of the air duct 13 can be changed by using the wedge 11A having no ventilation grooves 11G and the wedge 11B having the ventilation grooves 11G in combination.
  • the flow rates of all the circulation flow paths of the cooling gas are uniformized, and the temperature distribution in the circumferential direction of the stator core 8 can be uniformized.
  • Fig. 9 shows the third embodiment of the forced cooling rotary electric machine according to the invention.
  • This embodiment differs from the first and second embodiments in that a plurality of air ducts 13A and 13B each having a different space are provided in the axial direction of the stator core 8.
  • the packets 8P each of which is the stacking unit of silicon steel plates positioned between the air ducts 13A and 13B, have the same thickness.
  • the space of the air ducts 13A of the ventilation zones 15A1 at both end parts in the axial direction of the stator core 8 is made small, and the space of the air ducts 13B of the ventilation zones 15A2, 15B in the intermediate part in the axial direction of the stator core 8 is made large.
  • the cooling gas can be allowed to flow to the air ducts 13B in the intermediate part in the axial direction. Further, since the flow area of the air ducts 13B distant from the fans 2F is increased and the flow path resistance of the cooling gas decreases, the flow rate of the cooling gas increases. As a result, the flow rates of the cooling gas on the side close to the fans 2F and on the side distant from the fans 2F can be uniformized. Therefore, the temperature distribution of the stator core 8 can be uniformized.
  • the flow path resistance is changed by changing the spaces of the air ducts 13A and 13B. Further, the wedges 11A and 11B in the first and second embodiments are used. Therefore, the flow rate of the cooling gas flowing in all the circulation flow paths passing through the air ducts 13A and 13B can be uniformized more.
  • this embodiment can also achieve an effect equivalent to that of the first embodiment.
  • Fig. 10 shows the fourth embodiment of the forced cooling rotary electric machine according to the invention.
  • This embodiment differs from the third embodiment shown in Fig. 9 in that gap dimensions of all the air ducts 13 are made the same, the thickness of a packet 8P1 opposed to the ventilation zones 15A1 at the both end parts in the axial direction of the stator core 8 is increased, and the thickness of a packet 8P2 opposed to the ventilation zones 15A2, 15B is decreased.
  • the number of the air ducts 13 of the ventilation zones 15A1 at the both end parts in the axial direction of the stator core 8 is decreased, and the number of the air ducts 13 of the ventilation zones 15A2, 15B at the intermediate part in the axial direction of the stator core 8 is increased.
  • the flow rate of the cooling gas is increased, and thereby the flow rate of the cooling gas of the air ducts 13 of the ventilation zones 15A1 at the both end parts in the axial direction of the stator core 8 can be reduced.
  • the temperature distribution in the axial direction of the stator core 8 can be uniformized.
  • the wedges 11A, 11B in the first and second embodiments are used. Therefore, the flow rate of the cooling gas flowing in all the circulation flow paths passing through the air ducts 13A, 13B can be uniformized further.
  • Fig. 11 shows a modification of the wedge used.
  • the length of the wedge 11A, 11B is almost equal to the length of each of the ventilation zones 15A1, 15A2 and 15B, and the wedges 11A, 11B are selectively used to suit the ventilation zones 15A1, 15A2 and 15B.
  • a wedge 11C having a length L in which a section L1 having the same cross-sectional shape and a section L2 having the ventilation grooves 11G are mixedly provided may be used.
  • a plurality of such wedges 11C having the length L may be provided in each of the ventilation zones 15A1, 15A2 and 15B.
  • the wedge 11C having the length L may be provided astride the ventilation zones 15A1 and 15B and the ventilation zones 15A2 and 15B.
  • the flow path resistance of the circulation flow path of the cooling gas that is, the flow rate of the cooling gas passing through the air duct is regulated according to the length of the circulation flow path, in other words, the flow path resistance of the circulation flow path, and the temperature distribution in the axial direction of the stator core can be uniformized approximately.
  • the forced cooling turbine generator has been explained as one example.
  • the invention can also be applied to a forced cooling electric motor.
  • the forced cooling rotary electric machine in which the cooling gas is circulated within the machine has been explained.
  • the invention can also be applied to an open-type forced cooling rotary electric machine in which outside air is introduced, and the exhaust gas after cooling is discharged to the outside of the machine.
  • the open-type forced cooling rotary electric machine the lengths of the flow paths of the cooling gas from a fan for introducing outside air to an exhaust section via air ducts naturally differ, and the invention may be applied.
  • a flow path resistance regulating means for uniformizing the temperature of the stator winding incorporated in the winding grooves may be provided on the side facing to the rotor of the air ducts provided in the stator core to approximately uniformize the temperature distribution in the axial direction of the stator core.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)
EP08000490.6A 2007-01-15 2008-01-11 Drehende elektrische maschine mit zwangskühlung Active EP1944853B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007005779A JP4482001B2 (ja) 2007-01-15 2007-01-15 強制冷却型回転電機

Publications (3)

Publication Number Publication Date
EP1944853A2 true EP1944853A2 (de) 2008-07-16
EP1944853A3 EP1944853A3 (de) 2011-09-28
EP1944853B1 EP1944853B1 (de) 2019-10-02

Family

ID=39146906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08000490.6A Active EP1944853B1 (de) 2007-01-15 2008-01-11 Drehende elektrische maschine mit zwangskühlung

Country Status (6)

Country Link
US (2) US7898128B2 (de)
EP (1) EP1944853B1 (de)
JP (1) JP4482001B2 (de)
KR (1) KR100951923B1 (de)
CN (1) CN101227110B (de)
HK (1) HK1124181A1 (de)

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EP3054565A1 (de) * 2015-02-06 2016-08-10 Siemens Aktiengesellschaft Kühlanordnung
EP2360815A4 (de) * 2008-11-27 2017-04-26 Kabushiki Kaisha Toshiba Dynamoelektrische maschine und stator dafür

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ATE504108T1 (de) * 2008-02-27 2011-04-15 Alstom Technology Ltd Ventilatorkühlung eines elektroantriebs
US8018114B2 (en) * 2009-03-26 2011-09-13 Hamilton Sundstrand Corporation Generator rotor with improved wedges
US8344676B2 (en) * 2010-06-17 2013-01-01 General Electric Company Seal leakage and seal oil contamination detection in generator
US8564237B2 (en) 2010-06-17 2013-10-22 General Electric Company Seal leakage and seal oil contamination detection in generator
JP5860696B2 (ja) * 2011-01-05 2016-02-16 ゼネラル・エレクトリック・カンパニイ 発電機のシール漏れとシールオイル汚染の検出
US8368497B2 (en) * 2011-03-17 2013-02-05 Hamilton Sundstrand Corporation Transformer assembly with enhanced air cooling
US8587165B2 (en) 2011-03-30 2013-11-19 Dayton-Phoenix Group, Inc. Cooled fan motor and method of operation
JP2013066341A (ja) * 2011-09-20 2013-04-11 Toshiba Mitsubishi-Electric Industrial System Corp 回転電機
JP5647961B2 (ja) * 2011-09-26 2015-01-07 東芝三菱電機産業システム株式会社 回転電機
TWI488409B (zh) 2012-11-21 2015-06-11 Ind Tech Res Inst 定子模組及其磁力產生構件
CN102983644A (zh) * 2012-11-27 2013-03-20 大连天元电机股份有限公司 空水冷风力发电机定转子不等间距对称通风道
KR20150064624A (ko) * 2013-12-03 2015-06-11 현대자동차주식회사 계자권선형 전동기
CN104065186B (zh) * 2014-06-13 2017-10-17 新疆金风科技股份有限公司 一种用于电机的定子、电机及其通风冷却方法
CN104242502A (zh) * 2014-10-13 2014-12-24 山东齐鲁电机制造有限公司 一种电机定子铁芯内通风冷却结构及冷却方法
US10375901B2 (en) 2014-12-09 2019-08-13 Mtd Products Inc Blower/vacuum
EP3046225A1 (de) 2015-01-16 2016-07-20 Siemens Aktiengesellschaft Elektrische rotierende Maschine mit einseitiger Kühlung und Verfahren zur einseitigen Kühlung
CN104953766B (zh) 2015-06-17 2018-11-13 北京金风科创风电设备有限公司 电机径向通风冷却结构
CN110429746B (zh) * 2019-08-30 2020-11-20 东方电气集团东方电机有限公司 一种具有降低大直径电机线圈和铁心周向温差的装置
CN110429747B (zh) * 2019-08-30 2020-11-20 东方电气集团东方电机有限公司 一种降低电机线圈和铁心周向温差的方法
BR112022005964A2 (pt) 2019-09-30 2022-09-27 Weg Equipamentos Eletricos S/A Rotor para uma máquina elétrica girante e máquina elétrica girante
CN118140382A (zh) * 2021-10-27 2024-06-04 三菱电机株式会社 电动机、压缩机以及制冷循环装置
CN116317349A (zh) * 2023-02-01 2023-06-23 武汉奥特彼电机有限公司 一种电机的冷却机构

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2360815A4 (de) * 2008-11-27 2017-04-26 Kabushiki Kaisha Toshiba Dynamoelektrische maschine und stator dafür
EP3054565A1 (de) * 2015-02-06 2016-08-10 Siemens Aktiengesellschaft Kühlanordnung

Also Published As

Publication number Publication date
JP4482001B2 (ja) 2010-06-16
US20080169710A1 (en) 2008-07-17
KR100951923B1 (ko) 2010-04-09
US7898128B2 (en) 2011-03-01
US20110101801A1 (en) 2011-05-05
JP2008172968A (ja) 2008-07-24
US8049378B2 (en) 2011-11-01
HK1124181A1 (en) 2009-07-03
CN101227110B (zh) 2011-06-15
EP1944853B1 (de) 2019-10-02
EP1944853A3 (de) 2011-09-28
KR20080067301A (ko) 2008-07-18
CN101227110A (zh) 2008-07-23

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